Xforce Load Cells

Patented Xforce load cells—exclusively from Zwick Roell

Xforce load cells are ideal for tensile tests, compression tests, and flexure tests as well as for cyclic tests with zero crossing. The highly accurate patented Xforce load cells are used for all our load frame series. We make no compromises when it comes to quality.

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Significant Advantages and Features

Xforce load cells are based on a rotation-symmetrical or axis-symmetrical design principle, making them highly resistant to transverse forces.

All Xforce load cells are highly insensitive to parasitic influences such as transverse forces, bending moments, torque, and temperature variations.

Xforce load cells are very robust and can withstand loads up to 300% of nominal capacity without mechanical failure and up to 150% without zero-point shift.

These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.

Xforce load cells fulfill all five criteria of the ISO 7500-1 accuracy classes over a very large measurement range.

The heart of the testing system

Xforce load cells—the heart of the testing system

High-quality load cells are essential for achieving reliable, interpretable test results. To ensure that this core element is optimally integrated in the testing system, Zwick Roell has developed its own series of load cells: Xforce P (Precision), Xforce HP (High Precision), and Xforce K

The highly accurate Xforce P load cells are intended for use in tests which do not involve high transverse forces. This includes many tensile tests (though not on shear specimens, for example) as well as compression, flexure, and component tests in which no high transverse forces, bending moments, or torsional moments occur.

Xforce HP and Xforce K differ from Xforce P load cells primarily in their larger measurement range and greater resistance to parasitic influences, such as bending moments, torsional moments, and temperature variations. They are ideally suited to all static tensile, compression and flexure tests and are equally suitable for pulsating or cyclic tests with zero crossing.

Before dispatch, each load cell is calibrated with the testing machine plus drive and the measurement and control electronics as a complete system. This is recorded in the supplied factory calibration certificate.

All components from a single source: Zwick Roell develops and produces all system components in-house: testXpert III testing software, testControl measurement and control electronics, Xforce load cells, and all mechanical components.

Tips

Tips for optimal test results

Connections between the load cell and the components attached to the system, together with the test fixtures, should be as rigid and free of play as possible. This is because load cells frequently have to measure forces which change rapidly.

The smaller the test arrangement and therefore the lower the height, the fewer lever-arm effects will arise. Adapter units and extensions in particular generate undesirable lever-arm effects.

Lever arms and eccentricities should be avoided as far as possible in order to minimize bending moments. The further away from the test axis the force application point is, the greater is the influence of the bending moments.

Test fixtures/specimen grips and specimen must be aligned exactly to the test axis to enable controlled force application and distribution in the specimen to allow reliable, informative test results to be obtained. Alternatively, swiveling or spherical connections can be used to allow test fixtures to self-align and adapt to the specimen.

If several load cells are in use, or in the event of frequent load cell changes, we recommend use of the Connect 2nd Load Cell option.Alignment to the test axis is better via the plug-in system than via the usual threaded mounting, while reference positions for different test arrangements are also re-attained automatically. With the threaded fastening the reference positions change according to the number of turns. In addition, installation and removal are considerably easier with the plug-in system, while unnecessary strain on the load-cell cables is avoided.

Protect the load cell against overload by adjusting the
force thresholds in line with the test sequence. The testing system switches
off automatically if these force thresholds are reached.They can be set either directly on the testing system as hardware limit switches or in the testing software as software limit switches. In the case of tests in which set force-thresholds are not sufficient to exclude the risk of damage to the load cell, we recommend overload protection.

The ambient temperature must be kept broadly constant during the test to avoid the measurement signal being influenced by temperature fluctuations.

Self-identifying sensor plug

These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.

ISO 7500-1 contains general information on requirements for and on the verification and calibration of tensile, compression and flexure testing machines; spring testing machines and fatigue testing machines.

Accuracy to ISO 7500-1

All data apply to measured values in compression and tension directions.

All load cells are calibrated up to the relevant nominal force Fnom and satisfy the requirements of the following standards: EN ISO 7500 -1, EN ISO 7500 -2, ASTM E4.

Xforce load cells satisfy the calibration requirements and all five criteria of the ISO 7500-1 accuracy classes over a very large measurement range.

System calibration and large measurement range

System calibration

Before dispatch each load cell is calibrated with the testing system plus drive and the measurement and control electronics as a complete system. This is recorded in the accompanying factory calibration certificate.

Large measurement range

The large measurement range frequently eliminates the need to purchase a second load cell, saving the costs of acquisition and annual calibration.

Even with high pre-loads due to heavy test fixtures or specimen grips, virtually the entire load-cell measurement-range remains available. The load cell can still be used to full nominal capacity with fixture weights amounting to 45 % of nominal force.

The maximum display deviation is less than 1% of the measured value from as low as 0.1% of the load cell nominal capacity; from 0.4% of nominal capacity it is 0.25% of the measured value.

Overload protection, force limits and operating force

Xforce load cells are very robust and can withstand loads up to 300% of nominal capacity without mechanical failure and up to 150% without zero-point shift. This means that overload protection such as pre-loaded springs, mechanical stops or guiders to absorb transverse forces is generally unnecessary.

The design results in high operating forces, very small measurement travel, and high stiffness.

A high-quality shielded measurement cable with sensor plug provides the connection to the measurement amplifier for the measuring equipment.

Multi-bending beam

Bending ring

Xforce K, Fnom 10 to 250 kN

Xforce K+, Fnom 10 to 250 kN

In this version the spring element is a bending ring with a spiral strain-gage applied to its entire surface top and bottom.

The bending ring is connected to the hub and outer ring via circumferential elastic joints. When forces are transmitted to the load cell the bending ring deforms and its upper circumference increases whilst the lower circumference decreases, or vice versa. This deformation is recorded by spiral strain gages developed specifically for this load cell.

As the strain gages act uniformly over the entire surface of the bending ring, the load cell has no preferred direction.

Double bending beam

Technical overview

P - Precision

HP - High Precision

K - Load Cell

Xforce P, Fmax 5 N - 100 N

Xforce P (5 - 100 N)

Load cell

5

10

20

50

100

N

Item No.

057091

060253

060256

060257

060258

Item No. for ProLine

063919[1]

063920[1]

063921[1]

063922[1]

063923[1]

Nominal force Fnom

5

10

20

50

100

N

1.12

2.25

4.5

11.24

22.48

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.4 % of Fnom)

0.02[2]

0.04[2]

0.08

0.2

0.4

N

Accuracy Class 0.5 (from 2 % of Fnom)

0.1

0.2

0.4

1.0

2.0

N

Dimensions/weight

Installation height, approx.

55

55

55

55

55

mm

Connection

Mounting stud, Ø

8

8

8

8

8

mm

Connection thread

M28x1.5

M28x1.5

M28x1.5

M28x1.5

M28x1.5

Influences/limit values

Limit bending moment

0.7[3]

1.0[3]

1.3[3]

2.0[3]

3.0[3]

Nm

Limit torque

10.0[4]

10.0[4]

10.0[4]

10.0[4]

10.0[4]

Nm

Only in combination with a ProLine load frame. Please see note.

To enable calibration and use of the extended measurement range for 5 N and 10 N Xforces, the appropriate environmental and operating conditions must be present; this basically involves an installation site which is free from shocks and vibrations. More specific details can be found in the user manual and the installation instructions.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 200 N - 1 kN

Xforce P (0.2 - 1 kN)

Load cell

0.2

0.5

0.5

1

kN

Item No.

011563

011562

057993

011560

Item No. for ProLine

018542[1]

018540[1]

058423[1]

018539[1]

Nominal force Fnom

0.2

0.5

0.5

1

kN

45

112

112

225

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.4 % of Fnom)

0.8

2.0

2.0

4.0

N

Accuracy Class 0.5 (from 2 % of Fnom)

4.0

10.0

10.0

20.0

N

Dimensions/weight

Installation height, approx.

55

55

61

61

mm

Connection

Connection thread

M28x1.5

M28x1.5

M28x1.5

M28x1.5

Mounting stud, Ø

8

8

20

20[2]

mm

Influences/limit values

Limit bending moment

2 (3)[3][4]

5 (7)[3][4]

5 (7)[3][4]

15 (17)[3][4]

Nm

Limit torque

5 (14)[5][4]

7 (35)[5][4]

7 (35)[5][4]

17 (50)[5][4]

Nm

Only in combination with a ProLine load frame. Please see note.

With Xforce load cells the diameter of the mounting stud for a 1kN load cell has been changed from 8 mm to 20 mm!

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 2.5 kN - 10 kN

Xforce P (2.5 - 20 kN)

Load cell

2.5

5

10

10

20

kN

Item No.

011558

011556

017955

011554

017907

Item No. for ProLine

018538[1]

018537[1]

-

018536[1]

019242[1]

Nominal force Fnom

2.5

5

10

10

20

kN

562

1124

2248

2248

4496

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.4 % of Fnom)

10

20

40

40

80

N

Accuracy Class 0.5 (from 2 % of Fnom)

50

100

200

200

400

N

Dimensions/weight

Installation height, approx.

61

61

54

70

66

mm

Connection

Connection thread

M28x1.5

M28x1.5

-

M28x1.5

-

Mounting stud, Ø

20

20

20

20

36

mm

Connection flange

-

-

Flange 1[2]

-

Flange 1[2]

Influences/limit values

Limit bending moment

30 (34)[3][4]

50 (58)[3][4]

80 (115)[3][4]

80 (115)[3][4]

250 (460)[3][4]

Nm

Limit torque

17 (80)[5][4]

17 (130)[5][4]

17 (200)[5][4]

17 (200)[5][4]

250 (1500)[5][4]

Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 20 kN - 250 kN

Xforce P (30 - 250 kN)

Load cell

30

50

100

150

250

kN

Item No.

017908

017909

017910

017911

017912

Item No. for ProLine

019246[1]

019248[1]

019254[1]

-

-

Nominal force Fnom

30

50

100

150

250

kN

6744

11240

22481

33721

56202

lbf

Measurement range/measured displacement

Accuracy Class 1 (from 0.4 % of Fnom)

120

200

400

600

1000

N

Accuracy Class 0.5 (from 2 % of Fnom)

600

1000

2000

3000

5000

N

Installation height, approx.

Installation height, approx.

66

104

104

104

mm

Connection

Connection flange

Flange 1[2]

Flange 1[2]

Flange 2[2]

Flange 2[2]

Flange 2[2]

Influences/limit values

Limit bending moment

250 (500)[3][4]

250 (650)[3][4]

3500 (4500)[3][4]

4000 (5000)[3][4]

5000 (6000)[3][4]

Nm

Limit torque

250 (1800)[5][4]

250 (3000)[5][4]

6500 (10000)[5][4]

5800 (12500)[5][4]

11000 (15000)[5][4]

Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction
of measurement. In the case of simultaneous loading at nominal load, the values must
be halved.

The values refer to the limit torques of the connection system. If these
values are exceeded, recalibration is required. The values relating to the limit
torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce HP, Fmax 5 N - 100 N

Xforce HP (5 - 100 N)

Load cell

5

10

20

50

100

N

Item No.

063924

063925

063926

060259

060260

Item No. for ProLine

063927[1]

063929[1]

063930[1]

063932[1]

063933[1]

Nominal force Fnom

5

10

20

50

100

N

1.12

2.25

4.5

11.24

22.48

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.2 % of Fnom)

-

0.02[2]

0.04

0.1

0.2

N

Accuracy Class 1 (from 0.4 % of Fnom)

0.02[2]

-

-

-

-

N

Accuracy Class 0.5 (from 1 % of Fnom)

0.05

0.1

0.2

0.5

1.0

N

Dimensions/weight

Installation height, approx.

55

55

55

55

55

mm

Connection

Connection thread

M28x1.5

M28x1.5

M28x1.5

M28x1.5

M28x1.5

Mounting stud, Ø

8

8

8

8

8

mm

Influences/limit values

Limit bending moment

6.0[3]

6.0[3]

6.0[3]

6.0[3]

6.0[3]

Nm

Limit torque

10.0[4]

10.0[4]

10.0[4]

10.0[4]

10.0[4]

Nm

Only in combination with a ProLine load frame. Please see note.

To enable calibration and use of the extended measurement range for 5 N and 10 N Xforces, the appropriate environmental and operating conditions must be present; this basically involves an installation site which is free from shocks and vibrations. More detailed information can be found in the Operating Manual and the Installation Conditions.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce HP, Fmax 200 N - 1 kN

Xforce HP (0.2 - 1 kN)

Load cell

0.2

0.2

0.5

0.5

1

kN

Item No.

011571

052697

011570

057991

011569

Item No. for ProLine

018548[1]

-

018547[1]

058424[1]

018546[1]

Nominal force Fnom

0.2

0.2

0.5

0.5

1

kN

45

45

112

112

225

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.2 % of Fnom)

0.4

0.4

1.0

1.0

2.0

N

Accuracy Class 0.5 (from 1 % of Fnom)

2.0

2.0

5.0

5.0

10.0

N

Dimensions/weight

Installation height, approx.

55.3

66

55.3

61

61

mm

Connection

Connection thread

M28x1.5

M28x1.5

M28x1.5

M28x1.5

M28x1.5

Mounting stud, Ø

8

20

8

20

20[2]

mm

Influences/limit values

Limit bending moment

2 (3)[3][4]

2.0[3]

5 (7)[3][4]

5 (7)[3][4]

15 (17)[3][4]

Nm

Limit torque

5 (14)[5][4]

5.0[5]

7 (35)[5][4]

7 (35)[5][4]

17 (50)[5][4]

Nm

Only in combination with a ProLine load frame. Observe the relevant
notes.

With Xforce load cells the diameter of the mounting stud for a 1kN load cell has been changed from 8 mm to 20 mm!

Maximum bending moments Mb for a load cell which is unloaded in the direction
of measurement. In the case of simultaneous loading at nominal load, the values must
be halved.

The values refer to the limit torques of the connection system. If these
values are exceeded, recalibration is required. The values relating to the limit
torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values
must be halved.

Xforce HP, Fmax 2.5 kN - 10 kN

Xforce HP (2.5 - 10 kN)

Load cell

2.5

5

10

10

kN

Item No.

011568

011566

017953

011565

Item No. for ProLine

018545[1]

018544[1]

018554[1]

018543[1]

Nominal force Fnom

2.5

5

10

10

kN

562

1124

2248

2248

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.2 % of Fnom)

5.0

10.0

20.0

20.0

N

Accuracy Class 0.5 (from 1 % of Fnom)

25.0

50.0

100.0

100.0

N

Dimensions/weight

Installation height, approx.

61

61

54

70

mm

Connection

Connection thread

M28x1.5

M28x1.5

-

M28x1.5

Mounting stud, Ø

20

20

20

20

mm

Connection flange

-

-

Flange 1[2]

-

Influences/limit values

Limit bending moment

30 (34)[3][4]

50 (58)[3][4]

80 (115)[3][4]

80 (115)[3][4]

Nm

Limit torque

17 (80)[5][4]

17 (130)[5]

17 (200)[5][4]

17 (200)[5][4]

Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction
of measurement. In the case of simultaneous loading at nominal load, the values must
be halved.

The values refer to the limit torques of the connection system. If these
values are exceeded, recalibration is required. The values relating to the limit
torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values
must be halved.

Xforce K, Fmax 10 kN - 50 kN

Xforce K (10 - 50 kN)

Load cell

10

10

20

30

50

kN

Item No.

1008815

1008732

318936

325642

318934

Item No. for ProLine

-

1008733[1]

325222[1]

325644[1]

325223[1]

Nominal force Fnom

10

10

20

30

50

kN

2248

2248

4496

6744

11240

lbf

Measurement range/measurement travel

Accuracy Class 1 (from 0.2 % of Fnom)

20

20

40

60

100

N

Accuracy Class 0.5 (from 1 % of Fnom)

100

100

200

300

500

N

Dimensions/weight

Installation height, approx.

74

90

75.5

75.5

75

mm

Connection

Connection thread

-

M28x1.5

-

-

-

Mounting stud, Ø

20

20

36

36

36

mm

Connection flange

Flange 1[2]

-

Flange 1[2]

Flange 1[2]

Flange 1[2]

Influences/limit values

Limit bending moment

500[3]

500[3]

600[3]

700[3]

1100[3]

Nm

Limit torque

500[4]

500[4]

500[4]

500[4]

1800[4]

Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Maximum bending moments Mb for a load cell without a load in the measurement
direction. In the case of simultaneous loading at nominal load, the values must be
halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Daily Check

Device for checking load cells up to 500 N.

Application

This device is used for regular checks on load cells up to 500 N by means of comparison values which have been measured following recalibration / adjustment. The device consists of two reference standards (master/slave).

Routine checking is carried out with the slave device. A check is only made with the master device if deviations from the specified tolerance range are identified.

Traceability: all safety-critical tests place particular demands on traceability and documentation. Zwick testing software allows the administrator to specify what is logged and for which procedures and events reasons or explanations must be entered.

Technical data

Type

Device for checking load cells up to 500N

Item No.

3001493

Test load (Fmax)

50

N

Test travel

2 ... 50

mm

Tolerance

0-20N +/- 0,2N

20-50 N +/- 1%

Dimensions:

length

260

mm

top compression mandrel

Ø 12

mm

lower connection

Ø 20

mm

installation height

243

mm

Ambient temperature

+10 ... +35

°C

Weight per item, approx.

1,4

kg

Scope of delivery

2

pieces

Xforce Force-measuring System with Load Bypass Unit

During tests in the compression direction, Xforce HP load cells are safeguarded by mechanical overload protection and an integrated load bypass unit.

Advantages and features

large support width gives the force measurement system high axial and flexural stiffness

During tests in the compression direction, Xforce HP load cells are safeguarded by mechanical overload protection and an integrated load bypass unit.

In the case of the mechanical overload protection a mechanical stop locks at or above the load-cell nominal force, preventing damage to the load cell due to overload.

The integrated load bypass unit protects the entire test arrangement. From a defined load threshold (starting from the maximum capacity of the load cell) the existing load is transferred to several springs, allowing overtravel of the entire test assembly and thereby preventing an increase in force in the load cell which would result in overload or even
destruction.

Technical data (AllroundLine & ProLine)

Xforce force-measurement system with load bypass unit for AllroundLine/ProLine